| 摘要 |
PURPOSE:To prevent plugging of EGR passage of the captioned device, which regenerates a filter member in an exhaust system by means of a burner, by forming said device in such a manner as pressurized air for a burner is supplied into an air intake passage through EGR passage during high load operation. CONSTITUTION:When a filter member 13 to catch minute particles in exhaust gas is plugged and output is generated from a plugging detector 23, the second selector valve 31 is made inoperative by means of a control unit 7 and an air supply passage 20 for a burner is opened. Further, an air pump 21 and a fuel pump 15 are operated to put a burner device 14 in operation to burn caught minute particles. During normal operation after such plugging eliminating operation, EGR is performed through output of an accelerator opening detector 8, while it is performed through opening of the first selector valve 30 in low and medium load range. Further, in high load range, EGR is stopped and control is performed to supply the air pressurized by means of the air pump 21 to an air intake passage 2 through the second selector valve 31, communication passage 29 and EGR passage 4. |
